Smoking composition of reduced toxicity and method of making same

ABSTRACT

A smoking composition of reduced toxicity is disclosed, said composition being composed of tobacco wrapped in paper, said composition containing substantially equal molar amounts of ammonium ion and sulfamate ion, the total amount of ammonium ion and sulfamate ion in said composition being from 0.1 percent to 1.0 percent by weight, the tobacco of said composition containing at least 75 percent and preferably substantially all of the ammonium ion, and the paper of said composition containing at least 70 percent by weight of the sulfamate ion. A method for producing said composition involves adding ammonium sulfamate to the wrapper paper and, thereafter, placing the entire smoking composition composed of cured tobacco wrapped in said paper in a temperature and humidity zone having a relative humidity of between about 65 percent and 75 percent and a temperature of between 60* F. and 80* F. and allowing said tobacco composition to remain in said temperature and humidity zone for about 6 days and up to 14 days; thereby obtaining 75 percent or more migration of the ammonium ion of the ammonium sulfamate from the paper to the tobacco with at least 70 percent of the sulfamate ion of the ammonium sulfamate remaining in the paper. Preferably, the ammonium sulfamate is added to the paper in the form of a solution (e.g. an aqueous solution).

Cancer, Vol. 10, 1956, pp. 498- 503 inc.

United States Patent [72] Inventor Irving Michelson New Rochelle, N.Y.[211 App]. No. 20,057 [22] Filed Mar. 16, 1970 Patented Jan. 4, 1972[73] Assignee American Safety Equipment Corporation New York, N .Y.Continuation-in-part of application Ser. No. 751,413 Al r Q Q PLPEQ 7, 17 v This application Mar. 16, 1970, Ser. No. 20,057

[54] SMOKING COMPOSITION OF REDUCED TOXICITY AND METHOD OF MAKING SAME11 Claims, No Drawings [52] US. Cl 131/140, 131/9,131/15 [51] Int. (1 vA241 15/02, A24d 01/02 Field of Search 131/2, 9, 15,17,140-144 [56]References Cited UNITED STATES PATENTS 2,859,753 11/1958 Hitchcock et a1131/15 OTHER REFERENCES Alford and Cardon: The Inhibition of Formationof 3,4- Benzpyrene in Cigarette Smoke, from the British Journal ofPrimary Examiner-Melvin D. Rein Attorney-Miketta, Glenny, Poms & SmithABSTRACT: A smoking composition of reduced toxicity is disclosed, saidcomposition being composed of tobacco wrapped in paper, said compositioncontaining substantially equal molar amounts of ammonium ion andsulfamate ion, the total amount of ammonium ion and sulfamate ion insaid composition being from 0.1 percent to 1.0 percent by weight, thetobacco of said composition containing at least 75 percent andpreferably substantially all of the ammonium ion, and the paper of saidcomposition containing at least percent by weight of the sulfamate ion.A method for producing said composition involves adding ammoniumsulfamate to the wrapper paper and, thereafter, placing the entiresmoking composition composed of cured tobacco wrapped in said paper in atemperature and humidity zone having a relative humidity of betweenabout 65 percent and percent and a temperature of between 60 F. and F.and allowing said tobacco composition to remain in said temperature andhumidity zone for about 6 days and up to 14 days; thereby obtaining 75percent or more migration of the ammonium ion of the ammonium sulfamatefrom the paper to the tobacco with at least 70 percent of the sulfamateion of the ammonium 1 sulfamate remaining in the paper. Preferably, theammonium sulfamate is added to the paper in the form of a solution (e.g.

f an aqueous solution).

SMOKING COMPOSITION OF REDUCED TOXICITY AND METHOD OF MAKING SAMERELATED APPLICATIONS This application is a continuation-in-part of mycopending application, Ser. No. 75l,4l3, filed Aug. 9, 1968, now US.Pat. No. 3,517,672.

BACKGROUND OF THE INVENTION In recent years, the concern for the healthof tobacco smokers, particularly cigarette smokers, has increased. Thereason for this concern is because of the evidence gathered byscientists around the world that smoking definitely endangers the healthof the smoker to a greater or lesser extent, depending upon the amountof the smoke, the extent to which it is inhaled, and the person'ssusceptibility to being injured by tobacco smoke. For example, it isdefinitely established that cigarette smokers are more apt to developlung cancer, bronchitis, emphysema, and suffer other biological damagethan nonsmokers. Figures from Smoking and Health, report of the AdvisoryCommittee to the Surgeon General, indicate that heavy smokers are to 25times more susceptible to the risk of lung cancer than that ofnonsmokers and that light smokers chances of developing lung cancer isfive to 10 times that of nonsmokers. In addition, the mortality ofsmokers because of bronchitis and emphysema is five to eight times thatof nonsmokers.

Because of the foregoing and other evidence that smoking is detrimentalto the health and well being of people of all ages, the Federalgovernment of the United States has required all cigarette manufacturersto place on cigarette packages the warning that "Cigarette Smoking MayBe Hazardous to Your Health." In spite of this warning, the consumptionof cigarettes and other tobacco has actually decreased very little fromthe prior years. It is thus very apparent that people who are addictedto cigarette smoking are very unlikely to quit merely because they runthe risk of having their health seriously impaired.

lt is thus a desideratum in the art to produce a tobacco composition,the smoke of which has a reduced amount of components which are apt tocause biological damage to the smoker. It is therefore not surprisingthat in the past decade the prior art has endeavored to produce a safetobacco, particularly safe cigarettes. For the most part, the prior artattempts have centered around the idea of filtering out or screening thetars produced during the smoking of the tobacco. However, this has notbeen entirely satisfactory because inter alia it appears that thematerials produced in the smoking of the cigarette which causebiological damage cannot be filtered out selectively and therefore thefiltered smoke still contains substantially the same proportions ofdeleterious material as the unfiltered smoke.

ln my previously filed copending application, Ser. No. 751,413, there isdisclosed, inter alia, a method for producing smoking compositions, thesmoke of which contains a significantly reduced amount of componentswhich cause tumors on the skin of mice, have an adverse efi'ect on thepulmonary functions in test animals (guinea pigs) and destroy sebaceousglands in mice.

Moreover, in the previously filed application, Ser. No. 75 [,413, thesmoke of the cigarettes produced by the method set forth in thatapplication does not alter or afi'ect the taste of the tobacco smoke,the burning properties of the tobacco and paper or the appearance of theash of said tobacco and paper.

The advantages obtained by the invention disclosed in the previouslyfiled copending application are the result of adding ammonium sulfamateto tobacco compositions in a certain critical manner. In order toachieve the results, the ammonium sulfamate is applied to cigarettepaper by contacting the paper with the ammonium sulfamate and allowingthe paper to contact the tobacco until the ammonium ion has migratedinto the tobacco leaving only the sulfamate ion on the paper. It wasdiscovered that only after a significant amount, at least 50 percent butpreferably from 70 to percent, e.g. 75 percent, of the ammonium ion hadmigrated into the tobacco that the smoke produced from such tobaccoshowed a reduction in components which cause tumors on mice and otherbiological damage.

In the previously filed application it is indicated that about 6 weeksis required for 75 percent of the ammonium ion to migrate into thetobacco. As is apparent from tests set forth in the previously filedapplication it is desirable that at least 50 percent and preferably 75percent or more of the ammonium ion is in the tobacco prior to thecigarette being smoked. Having this much ammonium ion in the tobaccomaterially reduces the components in the smoke of such tobacco whichcause tumors on mice and other biological damage.

In 1967 and 1968 it took about 6 weeks for a cigarette to get from thecigarette manufacturing company to the ultimate consumer. However, earlyin 1969 the cigarette distribution system began a change in inventorypractice, with the goal of getting cigarettes to smokers more quicklybecause the many new brands of cigarettes were causing overcrowding indistributors warehouses. At the present time, it is the object ofcigarette manufacturers to have the cigarettes reach the ultimateconsumer in a shorter period of time, e. g. 2 weeks.

It is therefore a desideratum in the art to provide a method which willallow migration of the ammonium ion of ammonium sulfamate to the tobaccofrom paper wrapped around the tobacco in a very short time in order toinsure that the ammonium ion has migrated into the tobacco prior to thesmoking of the tobacco composition.

SUMMARY OF THE INVENTION The present invention is based upon thesurprising discovery that the ammonium ion of ammonium sulfamate addedto cigarette paper can be transferred to tobacco which is wrapped insaid cigarette paper in a very short period of time (at the very leastfaster than the time needed from the production of a cigarette until itpasses into the hands of the ultimate consumer). It is necessary thatthe ammonium ion has migrated into the tobacco from the paper in orderto have a smoking composition which has a materially reduced amount ofcomponents in the smoke thereof which cause tumors on the skin of miceand other biological damage but the smoke does not have any differenttaste than ordinary tobacco smoke or difierent burning properties.

The above advantages obtained by the method of this invention (as wellas the composition resulting from such method) are the result of addingammonium sulfamate to a smoking composition composed of tobacco wrappedin paper by contacting the paper (when the paper is either in contactwith the tobacco or prior thereto) with ammonium sulfamate andpreferably a solution of ammonium sulfamate (e.g. an aqueous solution).After the paper has been impregnated with ammonium sulfamate and alterthe paper has been wrapped around cured tobacco the resulting tobaccocomposition is' placed in a temperature and humidity zone having arelative humidity of between 65 percent and 75 percent and a temperatureof between 60 F. and 80 F. The tobacco composition is not removed fromsaid temperature and humidity zone until at least 50 percent andpreferably from 75 percent to percent of the ammonium ion has migratedfrom the paper to the tobacco. Depending upon the precise humidity andtemperature conditions the time will vary from say 3 days to 2 weeks.

Accordingly, the principal object of the present invention is todisclose and provide a method for making a smoking composition composedof tobacco wrapped in paper in a very short time, e.g. in 3 to 21 days,the smoke of said composition having a significantly reduced amount ofcomponents which cause tumors on the skin of mice and destroy sebaceousglands on the skin of mice.

Another object of the present invention is to disclose and embody amethod for treating a cigarette with ammonium sulfamate under controlledconditions such that 50 percent of the ammonium ion of the ammoniumsulfamate migrates from the cigarette paper to the tobacco in as littleas, e.g. 3 days.

' It is still a further object of the invention to rapidly produce whatis considered to be a less toxic cigarette (since the smoke componentswhich induce mice tumors are reduced) wherein the tobacco of saidcigarette contains a significant amount of ammonium ion which is derivedfrom ammonium sulfamate which has been applied to the paper of saidcigarette and allowed to stand under controlled temperature and humidityconditions.

Still another object of the invention is to disclose and provide acigarette made of cured tobacco wrapped in paper, said cigarettecontaining substantially equal molar amounts of ammonium ion andsulfamate ion, the total amount of ammonium ion and sulfamate ion insaid cigarette being from 0.1 percent to 1.0 percent by weight, thetobacco of said cigarette containing at least 75 percent and preferablysubstantially all of the ammonium ion and the paper of said cigarettecontaining at least 70 percent by weight and preferably substantiallyall of the sulfamate ion.

Still another and further object is to provide a novel method forproducing novel smoking compositions and cigarettes by applying anaqueous solution of ammonium sulfamate to the paper of such smokingcompositions and cigarettes by contacting the paper with a solutioncontaining ammonium sulfamate (either while the paper is wrapped aroundthe tobacco or, preferably, prior thereto) and placing the thus obtainedsmoking compositions or cigarettes in a temperature and humidity zonehaving a relative humidity of between 65 percent and 75 percent and atemperature of between about 60 F. and 80 F. and allowing said tobaccocompositions or cigarettes to remain in said temperature and humidityzone until at least 75 percent of the ammonium ion of the ammoniumsulfamate has migrated from the paper to the tobacco.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The smoking compositions ofthis invention are produced by adding a certain amount of ammoniumsulfamate to the paper of said compositions in a certain manner andallowing the ammonium ion to migrate from the paper to the tobacco whilethe smoking compositions are subjected to certain temperature andhumidity limitations.

1 have discovered that two things are critical in producing a less toxiccomposition; the amount of ammonium sulfamate added to the smokingcomposition and the amount of ammonium ion which migrates from the paperof the smoking composition to the tobacco of the composition.

Generally speaking, the amount of ammonium sulfamate added to thesmoking composition, based on the weight of the entire smokingcomposition, is from 0.1 percent to 1.0 percent by weight and thepreferred range of ammonium sulfamate is 0.2 percent to 0.8 percent.

In addition to having the ranges of ammonium sulfamate in the smokingcompositions set forth above it is also necessary to have a certainpercentage of the ammonium ion of the ammonium sulfamate migrate to thetobacco. In order to produce a less toxic smoking composition it appearsthat at least 50 percent of the ammonium ion should be in the tobaccoand, for best results, at least 75 percent of the ammonium ion should bein the tobacco. It is most desirable that substantially all of theammonium ion be in the tobacco and substantially all of the sulfamateion (at least about 70 percent) be in the paper.

In order to obtain a composition having 50 percent of the ammonium ionin the tobacco in 3 days and 75 percent in 6 to 7 days, it is necessary,after the cigarette paper has been wrapped around the tobacco, to placethe resulting smoking composition or cigarette in a temperature andhumidity zone having a temperature of between 60 F. and 80 F. and ahumidity of between about 65 percent and 75 percent. If the temperatureand/or humidity are higher than this, the ammonium ion will escape fromthe smoking composition to the.

outside atmosphere; apparently the ammonium sulfamate volatilizes andescapes to the surrounding air thereby preventing migration of 75percent of the ammonium ion from the paper into the tobacco. Ifthetemperature and/or humidity are lower than the ranges set forth above,the migration of the ammonium ion from the paper into the tobacco isslowed considerably. For example, when a cigarette containing about 0.5percent of ammonium sulfamate (based on the entire weight of thecigarette) is placed in a zone having 60 percent relative humidity and atemperature of 70 F., percent migration is not achieved until afterabout 42 days. In contrast thereto, when a cigarette made in exactly thesame manner is placed into a zone having a relative humidity of about 70percent and a temperature of about 70 F., 90 percent migration occurs inabout 14 days with over 75 percent migration of the ammonium ionoccurring in about 6 days. Over 50 percent migration occurs in 3 to 4days.

Surprisingly, it apparently makes no difference in migration time if thecigarettes are in packages or whether they are loose. The same resultsoccur in either case.

Ammonium sulfamate can be added to the cigarette paper in any convenientmanner; however, it is preferred to add the ammonium sulfamate to thecigarette paper when the ammonium sulfamate is dissolved in an aqueoussolution. This is because water does not affect the color of thecigarette paper.

If desired, and if not too many cigarettes are required (for example,2,000,000 or less), the ammonium sulfamate can be added by passing thecigarettes through a cylinder of suitable size and diameter which isfilled with an absorbent material such as a sponge, the cylinder havingan aperture or bore which forms a passage completely through thecylinder as well as the spongelike material through which the tobaccocomposition may be inserted without rupturing or tearing the paper. Asthe tobacco composition is passed through the cylinder, the paperthereon absorbs the ammonium sulfamate solution contained in thespongelike material. If conventional cigarettes are utilized, apassageway or bore in the cylinder and absorbent material will have adiameter on the order of eleven thirty-seconds of an inch. The speed atwhich the cigarette is passed through the bore or aperture depends uponthe particular concentration which is desired on the cigarette paper andalso the concentration of the solution in the sorbent material. Thecigarette can either be pushed manually through the device or in thealternative, can be pushed mechanically through the device at apredetermined speed as shown, e.g. U.S. Pat. No. 239,780. No matter howthe ammonium sulfamate is applied to the cigarette paper, the papershould not be adversely affected.

If the ammonium sulfamate is added in the manner indicated above some ofthe sulfamate ion will get into the tobacco via this route because thetobacco absorbs a certain amount of the solution. Depending upon thespecific conditions, anywhere from 10 percent to 15 percent or as muchas 30 percent of the sulfamate ion will be found in the tobacco when theammonium sulfamate solution is added by passing the cigarette through ahole in a sponge containing a solution of ammonium sulfamate.

In contrast thereto, when the ammonium sulfamate solution is added tothe paper per se (i.e., before the paper is wrapped around the tobacco),and the paper is allowed to dry and then wrapped around the tobacco,none of the sulfamate ion of the ammonium sulfamate migrates to thetobacco but the ammonium ion migrates at about the same rate as if thesolution had been added to the paper when the paper was wrapped aroundthe tobacco.

Regardless of the manner in which the ammonium sulfamate is added to thepaper, the smoking properties of the resulting composition, i.e., paperwrapped around tobacco, is not affected adversely, and, the smokeproduced from such a composition is less toxic than smoke produced froma corresponding untreated cigarette.

When adding the ammonium sulfamate to the paper prior to the paper beingwrapped around the tobacco, it can be done in the same way, and at thesame time, indeed in the same aqueous medium, as other solublecomponents are added to cigarette paper for controlling burningcharacteristics and color of the ash of cigarette paper.

To produce a cigarette containing between about 0.3 percent and 0.5percent, by weight, of ammonium sulfamate, a water solution containingbetween 5 percent and 25 percent, by weight, (depending on theproportion of solution retained by the paper after passing throughpressure rollers) of ammonium sulfamate is prepared by dissolving theammonium sulfamate in the requisite amount of water. Thereafter, a stripof commercial cigarette paper is passed through the aqueous solution(which may also contain other normal cigarette paper additives) and theexcess solution is squeezed out by pressure rollers. After the paper isdried, king size cigarettes (about 85 mm.) are made from the cigarettepaper, the cigarettes containing approximately 4 to 6 milligrams ofammonium sulfamate per cigarette. Since the cigarettes weigh about 1.2grams, this amounts to between about 0.3 to 0.5 percent of ammoniumsulfamate per cigarette.

Cigarettes made in such a manner were placed in a sealed chambermaintained at a relative humidity of about 70 percent and a temperatureof about 70 F. Prior to placing the cigarette in the chamber, 100percent of the ammonium ion and sulfamate ion was in the cigarette paperand no ammonium ion or sulfamate ion in the tobacco. The cigarettesremained in the chamber for 4 days and, at the end of 4 days, some ofthe cigarettes were removed and tested for ammonium and sulfamate ion.It was found that at the end of 4 days, 58 percent of the ammonium ionof the ammonium sulfamate had migrated to the tobacco. About 100 percentof the sulfamate ion still remained in the cigarette paper. At the endof 7 days, another group of cigarettes were removed and tested forammonium and sulfamate ion. It was found that about 78 percent of theammonium ion was in the tobacco with only 18 percent of the ammonium ionbeing in the paper. Again, about 100 percent of the sulfamate ionremained on the paper. At the end of 2 weeks (14 days) it was found thatabout 90 per cent of the ammonium ion had migrated to the tobacco and atthe end of three weeks substantially all (91 percent) of the ammoniumion had migrated to the tobacco. At the end of 21 days, substantiallyall of the sulfamate ion was found in the paper. Up to about l percentof the ammonium ion was lost to the atmosphere.

Cigarettes made in the same manner were placed in a sealed chambermaintained at a relative humidity of 60 percent and a temperature of 70F. Prior to placing the cigarettes in the chamber, it was found that thepaper of the cigarettes had approximately 100 percent of the ammoniumion and sulfamate ion. There was no ammonium or sulfamate ion in thetobacco. At the end of 3 days, it was found that 21 percent of theammonium ion had migrated to the tobacco and at the end of 9 days it wasfound that only 34 percent of the ammonium ion had migrated to thetobacco. Only at the end of 14 days was 50 percent of the ammonium ionin the tobacco. At the end of about weeks, it was found that only about80 percent of the ammonium ion had migrated to the tobacco,substantially all of the sulfamate ion remaining in the paper.

Based on tests conducted as indicated above and with cigarettes made asindicated above, I have found that when the relative humidity is 80percent or higher, the migration of ammonium ion is speeded up furtherbut ammonium ion is lost to the atmosphere at such a rate that it isimpossible to obtain 75 percent of the ammonium ion in the tobacco.Similarly, when the temperature is raised too high, ammonium ion is lostto the atmosphere although the criticality of the temperature is not asimportant as the relative humidity. Tests have shown that when thetemperature rises to about 80 F., the amount of ammonium ion lost to theatmosphere is too great to get 75 percent of the ammonium into thetobacco. When the temperature is too low, the migration of the ammoniumion is delayed. Based upon present test, the minimum temperature inwhich adequate migration can be achieved within say, 14 days is 60 F Butit is preferred if the temperature is about 70 F.

Biological tests have shown that the smoke of a cigarette treated withammonium sulfamate in which at least 50 percent of the ammonium ion hasnot had time to migrate to the tobacco will not reduce, to any greatextent, biological damage to mice and other test animals as comparedwith a normal cigarette. in contrast thereto, when over 50 percent ofthe ammonium ion has migrated to the tobacco (preferably 75 percent)biological tests have shown that the reduction of tumors in mice causedby such smoke is considerably greater when compared with correspondinglyuntreated cigarettes or with cigarettes treated with ammonium sulfamatein which the ammonium ion of the ammonium sulfamate is still primarilyon the paper.

Cigarettes containing 4 to 6 milligrams per cigarette (the cigarettesweigh about 1.2 grams) were made as indicated above. Two separategroups, one group containing about 75 percent of the ammonium ion in thetobacco and the other group containing less than 50 percent of theammonium ion in the tobacco, were prepared.

A third group of cigarettes were also made which were identical to thecigarettes above except that they had not been treated with ammoniumsulfamate. All of the cigarettes, i.e. all the cigarettes of each group,were smoked in a manifold-type smoking machine, one 2-second puff perminute, with the suction pressure equal to that which delivers a 17.5ml./sec. in sample cigarettes of the respective groups. The smoke wascondensed in 2-liter collection flasks and immersed in a dryice-methanol mixture. The condensate was removed from the flask withacetone. The acetone suspension was concentrated in a flash evaporatoruntil all the acetone was driven off. The remaining crude tar" wastreated with an equal volume of acetone and then eight volumes ofheptane were added slowly with vigorous shaking to provide a two phasesystem. The upper phase was concentrated in a flash evaporator until allthe heptane was apparently driven ofi. It has been shown that thisfraction of the tars contained all of the carcinogenic activity that isfound in crude cigarette tar.

The tars were then applied to female ICR Swiss mice which were 60 to 70days old. The mice were divided into three groups, in each group, andthe mice in each group were shaved and painted 2 times daily, 5 days aweek, for approximately one year with a solution of tar. About once amonth the tar was replaced by a fresh batch which was obtained in exactly the same manner as the original tar.

At the end of one year, the mice which had been painted with the tarsproduced from the untreated or control cigarettes had the same number oftumors as the mice painted with tars produced from cigarettes containingammonium sulfamate in which less than 50 percent of the ammonium ion hadmigrated to the tobacco. In contrast thereto, the mice painted with tarsproduced from the cigarettes which had ammonium sulfamate added theretoand in which over 75 percent of the ammonium ion had migrated to thetobacco had a 45 percent reduction of tumors as compared with the twoother groups.

Moreover, when the above cigarettes were tested on mice for sebaceousgland suppression activity, it was found that mice painted with tarsproduced from cigarettes of this invention (75 percent of the ammoniumion is in the tobacco) had 65 percent of the glands remaining whereasmice painted with tars from the untreated cigarettes and the cigaretteswhich had less than 50 percent of the ammonium ion in the tobacco hadapproximately only 40 percent of the glands remaining.

It will be understood that the foregoing description of the presentinvention is only illustrative and it is not intended that the inventionbe limited thereto. Many other specific embodiments of the presentinvention will be apparent to one skilled in the art and anysubstitutions, alterations and modifications of the invention which comewithin the scope of the following claims or to which the invention isreadily susceptible without departing from the spirit and scope of thisdisclosure are considered a part of the present invention.

1 claim:

1. A method for rapidly producing smoking composition of 5 reducedtoxicity of cured tobacco wrapped in paper, which comprises adding fromabout 0.1 percent to 1.0 percent by weight, based on the combined weightof the paper and tobacco, of ammonium sulfamate to said paper andplacing the tobacco and the wrapped paper containing said ammoniumsulfamate in a temperature and humidity zone having a relative humidityof between about 65 percent and 75 percent and a temperature of betweenabout 60 F. and 80 F. and removing the resulting tobacco compositionafter at least about 3 days and when 50 percent of ammonium ion of theammonium sulfamate has migrated from the paper to the tobacco.

2. A method according to claim 1 wherein the tobacco composition isremoved when 75 percent of ammonium ion has migrated to the tobacco.

3. A method according to claim 2 wherein the ammonium sulfamate is addedto the paper by contacting said paper with solution containing ammoniumsulfamate.

4. A method according to claim 3 wherein the solution containingammonium sulfamate is an aqueous solution.

5. A method according to claim 4 wherein the amount of ammoniumsulfamate in said aqueous solution is between about 5 percent and 50percent, by weight. I

6. A method according to claim 3 wherein the ammonium sulfamate is addedto said paper prior to the paper being wrapped around the tobacco.

7. A method according to claim 6 wherein the solution containingammonium sulfamate is an aqueous solution.

8. A method according to claim 1 wherein the tobacco wrapped in paper isallowed to remain in the humidity and temperature zone from 3 to 21days.

9. A method according to claim 2 wherein the tobacco wrapped in paper isallowed to remain in the humidity and temperature zone from 7 to 21days.

10. A method according to claim 2 wherein the amount of ammoniumsulfamate added to the paper is from 0.2 percent to 0.8 percent, byweight, based on the combined weight of the paper and tobacco.

11. A smoking product made by the method of claim 1.

2. A method according to claim 1 wherein the tobacco composition is removed when 75 percent of ammonium ion has migrated to the tobacco.
 3. A method according to claim 2 wherein the ammonium sulfamate is added to the paper by contacting said paper with solution containing ammonium sulfamate.
 4. A method according to claim 3 wherein the solution containing ammonium sulfamate is an aqueous solution.
 5. A method according to claim 4 wherein the amount of ammonium sulfamate in said aqueous solution is between about 5 percent and 50 percent, by weight.
 6. A method according to claim 3 wherein the ammonium sulfamate is added to said paper prior to the paper being wrapped around the tobacco.
 7. A method according to claim 6 wherein the solution containing ammonium sulfamate is an aqueous solution.
 8. A method according to claim 1 wherein the tobacco wrapped in paper is allowed to remain in the humidity and temperature zone from 3 to 21 days.
 9. A method according to claim 2 wherein the tobacco wrapped in paper is allowed to remain in the humidity and temperature zone from 7 to 21 days.
 10. A method according to claim 2 wherein the amount of ammonium sulfamate added to the paper is from 0.2 percent to 0.8 percent, by weight, based on the combined weight of the paper and tobacco.
 11. A smoking product made by the method of claim
 1. 